wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 120

• Manufacturer Part Number: wm8400
• Description: Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
• Manufacturer: Wolfson Microelectronics plc

WM8400
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Figure 66 TDM with WM8400 as Master
Figure 68 TDM with Processor as Master
Note: The WM8400 is a 24-bit device. If the user operates the WM8400 in 32-bit mode then the 8
LSBs will be ignored on the receiving side and not driven on the transmitting side. It is therefore
recommended to add a pull-down resistor if necessary to the DACDAT line and the ADCDAT line in
TDM mode.
BCLK DIVIDE
The BCLK frequency is controlled by BCLK_DIV. When the ADCs and DACs are operating at
different sample rates, BCLK_DIV must be set appropriately to support the data rate of whichever is
the faster.
Internal clock divide and phase control mechanisms ensure that the BCLK, ADCLRC and DACLRC
edges will occur in a predictable and repeatable position relative to each other and to the data for a
given combination of DAC sample rate, ADC sample rate and BCLK_DIV settings.
See “Clocking and Sample Rates” section for more information.
CODEC
WM8400
WM8400
WM8400
Similar
CODEC
Similar
WM8400
or
or
BCLK
ADCLRC
DACLRC
ADCDAT
DACDAT
BCLK
ADCLRC
DACLRC
ADCDAT
DACDAT
ADCLRC
DACLRC
ADCDAT
DACDAT
ADCLRC
DACLRC
ADCDAT
DACDAT
BCLK
BCLK
Processor
Processor
Figure 67 TDM with Other CODEC as Master
WM8400
WM8400
CODEC
Similar
or
ADCLRC
DACLRC
ADCDAT
DACDAT
ADCLRC
DACLRC
ADCDAT
DACDAT
BCLK
BCLK
PP, April 2009, Rev 3.0
Pre-Production
Processor
120